The biofertilizers are
Correct answer: A. Anabaena and Azolla
- A. Anabaena and Azolla
- B. Cow dung, manure, and farmyard waste
- C. Quick growing crop plowed under soil
- D. None of these
Explanation
Biofertilizers are organisms that bring about nutrient enrichment of the soil. Azotobacter is a free-living, aerobic, nitrogen-fixing bacteria. Anabena is a nitrogen-fixing cyanobacteria that occurs in both free-living and symbiotic associations with Azolla, Cycas roots, etc. Rhizobium lives symbiotically in root nodules of legumes and non legumes. Vesicular-arbuscular mycorrhiza (VAM) is an example of endomycorrhiza in which fungal hyphae penetrate the cortical cells of grasses to form vesicles.
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